[Fetch] Body consume function should not set bodyUsed flag.

LayoutTests/http/tests/cachestorage/script-tests/cache-put.js

 if (self.importScripts) {
     importScripts('/resources/testharness.js');
     importScripts('/resources/testharness-helpers.js');
     importScripts('../resources/test-helpers.js');
 }
 
 var test_url = 'https://example.com/foo';
 var test_body = 'Hello world!';
 
 cache_test(function(cache) {
@@ skipping 294 matching lines @@
       cache.put(request, new Response(test_body)),
       new TypeError(),
       'Cache.put should throw a TypeError for a request with used body.');
   }, 'Cache.put with a used request body');
 
 cache_test(function(cache) {
     var response = new Response(test_body);
     assert_false(response.bodyUsed,
                  '[https://fetch.spec.whatwg.org/#dom-body-bodyused] ' +
                  'Response.bodyUsed should be initially false.');
-    response.text().then(function() {
-      assert_true(
+    return response.text().then(function() {
+      assert_false(
         response.bodyUsed,
         '[https://fetch.spec.whatwg.org/#concept-body-consume-body] ' +
-          'The text() method should consume the body of the response.');
-      return assert_promise_rejects(
-        cache.put(new Request(test_url), response),
-        new TypeError(),
-        'Cache.put should throw a TypeError for a response with used body.');
+          'The text() method should not set "body passed" flag.');
+      return cache.put(new Request(test_url), response);
     });
   }, 'Cache.put with a used response body');
 
 done();